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1. 

   Joined: May 14, 2023
   Posts: 1

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   53Mercuryvert

   If speedometer is indicating faster than actual speed, do you go up or down with tooth count

    

   53Mercuryvert, May 9, 2025

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2. 

   Joined: Sep 4, 2009
   Posts: 3,406

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   FrozenMerc

   Member

   from Springfield

   You need to slow the cable RPM down, so up in tooth count.

    

   FrozenMerc, May 9, 2025

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   38Chevy454 and jaracer like this.
3. 

   Joined: Apr 17, 2005
   Posts: 1,240

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   Relic Stew

   Member

   from Wisconsin

   Standard speedometers are designed to display 60 mph at 1000 rpm. Calculate driveshaft rpm from gear ratio and tire circumference, then you'll have the ratio you need in the speedometer drive gears.

    

   Relic Stew, May 9, 2025

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